Electric alarm-clock.



No. 838,918. PATENTED DEC. 18, 1906.

. L. TRBDB.

ELECTRIC ALARM CLOCK. APPLIOATION FILED JUNE 15, 1906.

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11 Main]: PETERS ca, wAsnmcro-V. n. c.

LOUIS TREDE, OF DURANT, IOWA.

ELECTRIC ALARM-CLOCK.

Specification of Letters Patent.

Patented Dec. 18, 1906.

Application filed June 15,1906. Serial No. 321,861.

ing is a specification.

My invention relates to improvements in electric clock-alarms, and refers to a devlce of this character which may be readily attached to any clock of ordinary construction- The. object of my invention is the provision of an alarm which will operate with precision, which may be easily regulated or set for the proper time, and which will be thoroughly reliable and practical.

Another objectof the invention is to provide an electric alarm which will operate with economy and will be of simple, durable, and inexpensive construction.

With these and other objects in view my invention consists of a dial, an alarm-hand mounted thereon, an insulated contact-ring on the dial, a contact spring on the alarmhand adapted to contact the ring, a clock hand provided with an insulated point to cause contact of the contact-spring and ring, and an electric circuit including an alarm having as its terminals the alarm-hand and the contact-ring.

My invention further consists of an electric alarm embodying certain other novel features of construction, combination, and arrangement of parts, substantially as disclosed herein.

Figure 1 is a front or face view of a clock having my improved electric alarm applied thereto. Fig. 2 is a sectional view of the clock-face on the line 2 2 of Fig. 1. Fig. 3 is a detail view of the clock-hand carrying the means for closing the electrical circuit. Fig. 4 is a plan or diagrammatical view of the wiring system.

In the drawings, the numeral 1 designates a clock of ordinary construction provided with the usual dial-plate 2. Centrally mounted in the dial-plate is a bushing or sleeve 3, of rubber, paper, or any other suit-.

able insulating material. The bushing proj ects slightly beyond the face of the dial and is provided in its upper portion with an annular groove or channel 4, in which is seated or secured the contact-ring 5. This ring forms one terminal of the electric circuit and is suitably connected by the wire 6 to one pole of the battery 8. A plate or disk 7, formed with the integral depending lugs 9, is secured upon the face of the dial by the studs or fastenings 10. A second disk 11 is mounted upon the stationary disk and secured thereon by means of the inturned edges or flange 12, which frictionally bind against the edge of the stationary disk. The edge of the movable disk may be corrugated or knurled, as shown, so as to afiord a ready hold for rotating the same. Mounted upon the movable disk or formed integral therewith is a pointer or hand 12 which I will designate the alarmhand. Secured near the outer end of the said alarm-hand is a spring-tongue 13, the inner end of which extends over the contact-ring.

Upon the outer end of the arbor 14 is mounted the usual hour-hand 15 at the inner end and under face of which is secured a block of insulating material 16, in which is secured one end of the spring 17. This spring is preferably formed with a coil or loop 18 intermediate its length and a lower depending free arm 19, adapted to depress the contact-spring 13 when the hour-hand is in the proper position.

A switch 20 is conveniently located upon the exterior of the clock-case, and extending from one point of the switch is a wire 21, which preferably leads direct to the stationary disk on the dial-plate, although this wire may simply be grounded on the movement of the clock. From the other point of the switch a conductor 22 leads to an alarm-bell 23, which may be located in the clock-case or elsewhere. A wire 24 leads from the opposite terminal of the bell to the return-pole of the battery, and thus completes the circuit.

In the operation of the alarm the movable disk on the clock-dial is rotated until the alarm-hand registers with the proper hour or fraction of an hour on the dial. Vhen the hour-hand reaches the time at which the alarm is set, the insulated point or spring on the hour-hand depresses the contact-spring 13 and causes it to engage the contact-ring 5. The electrical circuit is then closed, and the path of the current is as follows: from the positive pole of the battery, through wire 6 to the insulated ring on the dial-plate, from the ring to the contactspring 13 and alarm-hand and thence by the wire 21 to the switch 20, wire 22, alarm 23, and return-wire 24, back to the opposite'pole of the battery. The

' length of the depressing-point on the hourhand may be changed to suit various conditions, so as to ring the alarm for along or a short period of time, as desired.

From this description, taken in connection With the drawings, it Will be evident that I have accomplished all the objects herein stated and have provided a cheap and effective electrical alarm for timepieces.

1; The combinationwith a timepiece, of a contact-ring mountedonthe dial thereof, an alarm-hand rotatably mounted on the dialandcarrying a contact-spring to engage the contact-ring; apoint carried by one of theclock-hands to depress said spring, and an electric circuit including" an alarm, and having as its terminals, the contact-ring and contact-spring.

2. The combination- With a timepiece, 1 of an insulated contact-ring mounted on the dial thereof, an alarmhand adjustably mounted on the dial; a-spring carriedby said alarm-hand-adapted'to contact the insulated ring, means for causing engagement of the the ring and spring.

4. The combination With the dial of a timepiece, of an insulated contact-ring centrally mounted thereon, an alarmehand rotatably mounted on the dial, a spring carried thereby adapted to contact the: insulated ring, clock-handspassingover the dial, an

insulated point on one of the clock-hands,

adapted to depress the contact-spring, and

an electric alarm circuit included between the contact-spring and insulated ring.

In testimony WhGIGOfI' aflix my signature in presence of two Wit/1168868.

- LOUIS TREDE. Witnesses:

W. H. CREOELIUs, ARNOLD WIEBENER; 

